Frost Walls or Alaskan and Minimizing Waste?

Hey all, we live in Northern VT, looking to get any and all opinions or recommendations on the concrete foundation in the attached schematic. Hoping to save on concrete costs with an Alaskan/monolithic slab or a frost protected shallow foundation rather than full on frost walls, wondering about the structural viability of both. Also open to any recommendations around cutting down on dimensions to minimize excess material waste. Thanks! Schematic Drawings